Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.267
Stefan Frangov
Photovoltaic power plants have recently become increasingly common to reduce carbon emissions into the atmosphere. Non-fertile lands occupied by industrial waste are very suitable for their construction. The present study concerns the design and construction of a photovoltaic park on the territory of a reclaimed coal tailings dump “Suhoto Dere” near the TPP “Bobov Dol”. The study includes collection, processing and analysis of archival materials, site mapping, drilling of exploration boreholes, dynamic penetration tests, geophysical electrical resistivity survey, laboratory testing of soil samples to determine physical and mechanical properties; chemical analysis of soil samples to assess soil aggressiveness to concrete and steel. Based on the obtained data, an assessment of the suitability of the site is made and recommendations are given to prevent the occurrence of adverse phenomena and processes.
为了减少大气中的碳排放，光伏发电站最近变得越来越普遍。被工业废弃物占据的非肥沃土地非常适合建造光伏电站。本研究涉及在 "Bobov Dol "风力发电厂附近的 "Suhoto Dere "煤炭尾矿填埋场上设计和建造一个光伏园区。研究内容包括档案资料的收集、处理和分析，现场测绘，钻探孔，动态渗透试验，地球物理电阻率测量，土壤样本的实验室测试，以确定物理和机械性能；土壤样本的化学分析，以评估土壤对混凝土和钢材的侵蚀性。根据获得的数据，对场地的适宜性进行评估，并提出建议，以防止不利现象和过程的发生。
{"title":"Engineering geological conditions for the construction of a photovoltaic power plant on coal tailings","authors":"Stefan Frangov","doi":"10.52215/rev.bgs.2023.84.3.267","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.267","url":null,"abstract":"Photovoltaic power plants have recently become increasingly common to reduce carbon emissions into the atmosphere. Non-fertile lands occupied by industrial waste are very suitable for their construction. The present study concerns the design and construction of a photovoltaic park on the territory of a reclaimed coal tailings dump “Suhoto Dere” near the TPP “Bobov Dol”. The study includes collection, processing and analysis of archival materials, site mapping, drilling of exploration boreholes, dynamic penetration tests, geophysical electrical resistivity survey, laboratory testing of soil samples to determine physical and mechanical properties; chemical analysis of soil samples to assess soil aggressiveness to concrete and steel. Based on the obtained data, an assessment of the suitability of the site is made and recommendations are given to prevent the occurrence of adverse phenomena and processes.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139193138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.279
Metodi Karadjov, D. Karastanev, Boriana Tchakalova
This study investigated the geochemical characteristics of Pliocene clay sediments from the Brusartsi Formation, situated in the area of the town of Kozloduy, North Bulgaria). The main objective of the study is to characterize the Brusartsi clays as a natural barrier against pollutant and radionuclide migration. Based on mineralogical and geochemical analyses, new results are obtained concerning the mineral composition, cation exchange capacity (CEC), specific surface area, etc., for the Brusartsi Formation.
{"title":"Geochemical characteristics of silty clays from the Brusartsi Formation","authors":"Metodi Karadjov, D. Karastanev, Boriana Tchakalova","doi":"10.52215/rev.bgs.2023.84.3.279","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.279","url":null,"abstract":"This study investigated the geochemical characteristics of Pliocene clay sediments from the Brusartsi Formation, situated in the area of the town of Kozloduy, North Bulgaria). The main objective of the study is to characterize the Brusartsi clays as a natural barrier against pollutant and radionuclide migration. Based on mineralogical and geochemical analyses, new results are obtained concerning the mineral composition, cation exchange capacity (CEC), specific surface area, etc., for the Brusartsi Formation.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139194910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.31
H. Georgieva, R. Nedialkov, Elitsa Stefanova, Georgi Milenkov, Ivan Krumov, Neven Georgiev
The skarn alteration is poorly preserved at the Elatsite, restricted to the hornfelses from the East, Southeast and Southern part of the deposit. The rocks are defined as exoskarns, with a mineral composition including garnets, epidote, pyroxene, amphiboles, carbonates, prehnite, quartz, sulphides. The newly formed minerals occur in poorly preserved layers. The garnet grains are subhedral with inclusions of epidote and quartz, while some of them are corrode with carbonate and zeolites formed in the fractures. The garnets are grossular-andradite type, with higher values for HREE over LREE, and low values for Rb, Sr, Ba, Pb and U. The skarn formation is related with the intrusion of the magma which causes the heating of the metamorphic rocks (rich in carbonate material – chlorite-sericite-carbonite, sericite-carbonate schists, etc.) from the low-grade metamorphic rocks. The Fe+3–Al+3 exchanges in the cores of the garnets indicate their formation from fluids with high oxygen fugacity.
{"title":"Preliminary data on the mineral chemistry of garnet from the skarn alteration associated with the Elatsite porphyry-copper gold deposit, Bulgaria","authors":"H. Georgieva, R. Nedialkov, Elitsa Stefanova, Georgi Milenkov, Ivan Krumov, Neven Georgiev","doi":"10.52215/rev.bgs.2023.84.3.31","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.31","url":null,"abstract":"The skarn alteration is poorly preserved at the Elatsite, restricted to the hornfelses from the East, Southeast and Southern part of the deposit. The rocks are defined as exoskarns, with a mineral composition including garnets, epidote, pyroxene, amphiboles, carbonates, prehnite, quartz, sulphides. The newly formed minerals occur in poorly preserved layers. The garnet grains are subhedral with inclusions of epidote and quartz, while some of them are corrode with carbonate and zeolites formed in the fractures. The garnets are grossular-andradite type, with higher values for HREE over LREE, and low values for Rb, Sr, Ba, Pb and U. The skarn formation is related with the intrusion of the magma which causes the heating of the metamorphic rocks (rich in carbonate material – chlorite-sericite-carbonite, sericite-carbonate schists, etc.) from the low-grade metamorphic rocks. The Fe+3–Al+3 exchanges in the cores of the garnets indicate their formation from fluids with high oxygen fugacity.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139194965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.51
G. Săbău, George Dincă, Andra-Elena Filiuță
The three known polymorphs of nickel diarsenide were found to coexist in apparent equilibrium in the five-element mineralizations of the Bihor Metallogenetic District. It is the first identification of pararammelsbergite and krutovite in Romania, and the locality joins a very limited list of occurrences where all three NiAs2 polymorphs coexist. Both phases newly identified in Romania are easily distinguishable from rammelsbergite by their optical properties and display consistent compositional differences manifested in stoichiometry and degree of isomorphic substitution. The NiAs2 polymorphs coexist with nickeline and skutterudite and apparently predate cobaltite-gersdorffite in a mesothermal depositional sequence characterized by initial separation of Ni and Co in metal-poorer arsenides, followed by continuous decrease of arsenic activity, increase in sulfur activity, modal increase of nickeline and Co enrichment in the gersdorffite-cobaltite series.
{"title":"Coexisting nickel diarsenide polymorphs in the five-element mineralization of the Bihor metallogenetic district, Apuseni Mountains, Romania","authors":"G. Săbău, George Dincă, Andra-Elena Filiuță","doi":"10.52215/rev.bgs.2023.84.3.51","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.51","url":null,"abstract":"The three known polymorphs of nickel diarsenide were found to coexist in apparent equilibrium in the five-element mineralizations of the Bihor Metallogenetic District. It is the first identification of pararammelsbergite and krutovite in Romania, and the locality joins a very limited list of occurrences where all three NiAs2 polymorphs coexist. Both phases newly identified in Romania are easily distinguishable from rammelsbergite by their optical properties and display consistent compositional differences manifested in stoichiometry and degree of isomorphic substitution. The NiAs2 polymorphs coexist with nickeline and skutterudite and apparently predate cobaltite-gersdorffite in a mesothermal depositional sequence characterized by initial separation of Ni and Co in metal-poorer arsenides, followed by continuous decrease of arsenic activity, increase in sulfur activity, modal increase of nickeline and Co enrichment in the gersdorffite-cobaltite series.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139195023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.155
Neven Georgiev
The crustal thickness in the area of the Rhodope Metamorphic Complex decreases from west to east from ~50 km to ~30 km. This regional-scale feature is mostly due to the different rates of extension that the basement rocks experienced in different parts of the complex. In our model, we postulate that the crustal thickness in the area is an effect of the late Eocene zipper-like or hinge-like extensional tectonics that caused a larger amount exhumation of high-grade metamorphic rocks in the eastern parts of the area and lesser one in the west. This zipper-like orogen parallel extension caused a vast tectonic erosion and progressive thinning of the crust from west to east.
{"title":"The crustal thickness in the Rhodope Metamorphic Complex area from the perspective of the present-day geological knowledge","authors":"Neven Georgiev","doi":"10.52215/rev.bgs.2023.84.3.155","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.155","url":null,"abstract":"The crustal thickness in the area of the Rhodope Metamorphic Complex decreases from west to east from ~50 km to ~30 km. This regional-scale feature is mostly due to the different rates of extension that the basement rocks experienced in different parts of the complex. In our model, we postulate that the crustal thickness in the area is an effect of the late Eocene zipper-like or hinge-like extensional tectonics that caused a larger amount exhumation of high-grade metamorphic rocks in the eastern parts of the area and lesser one in the west. This zipper-like orogen parallel extension caused a vast tectonic erosion and progressive thinning of the crust from west to east.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139196168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.257
Mihail Tarassov, Nadezhda Lihareva, E. Tarassova, E. Tacheva, Milen Stavrev
A four-step sequential extraction procedure (SEP) was used to assess the distribution of W fractionation in the topsoil (0–20 cm) of the soil above the oxidation zone of the W deposit. Data on the extraction of W and other elements were obtained using LA-ICP-MS and SEM-EDX analyses of the dried, sieved and finely grinded original soil and residual samples after each step of the procedure. When processing LA-ICP-MS data, the SiO2 content of the original soil was used as an internal standard for all samples in the sequential extraction procedure. It was found that of the approximately 90 ppm of total W content in the soil, about 25% is associated with organic matter, 40% with amorphous hydrous Fe oxides (ferrihydrite), 25% with crystalline hydrous Fe oxides (goethite), and about 10% with residual material (scheelite, silicates).
采用四步顺序萃取法（SEP）评估了 W 矿床氧化带上方土壤表层土（0-20 厘米）中 W 的分馏分布情况。在每一步萃取程序之后，对经过干燥、筛分和细磨的原始土壤和残留样品进行 LA-ICP-MS 和 SEM-EDX 分析，获得了 W 和其他元素的萃取数据。在处理 LA-ICP-MS 数据时，原始土壤中的 SiO2 含量被用作顺序提取程序中所有样品的内标。研究发现，在土壤中约 90 ppm 的总 W 含量中，约 25% 与有机物有关，40% 与无定形的水合铁氧化物（铁菱锰矿）有关，25% 与结晶水合铁氧化物（高铁锰矿）有关，约 10% 与残留物质（白钨矿、硅酸盐）有关。
{"title":"Fractionation of W in the topsoil of a meadow soil above the oxidation zone of the W deposit: results of sequential extraction and LA-ICP-MS analysis of soil from the Grantcharitsa deposit, Bulgaria","authors":"Mihail Tarassov, Nadezhda Lihareva, E. Tarassova, E. Tacheva, Milen Stavrev","doi":"10.52215/rev.bgs.2023.84.3.257","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.257","url":null,"abstract":"A four-step sequential extraction procedure (SEP) was used to assess the distribution of W fractionation in the topsoil (0–20 cm) of the soil above the oxidation zone of the W deposit. Data on the extraction of W and other elements were obtained using LA-ICP-MS and SEM-EDX analyses of the dried, sieved and finely grinded original soil and residual samples after each step of the procedure. When processing LA-ICP-MS data, the SiO2 content of the original soil was used as an internal standard for all samples in the sequential extraction procedure. It was found that of the approximately 90 ppm of total W content in the soil, about 25% is associated with organic matter, 40% with amorphous hydrous Fe oxides (ferrihydrite), 25% with crystalline hydrous Fe oxides (goethite), and about 10% with residual material (scheelite, silicates).","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139191018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.85
Stoyan Georgiev, Elitsa Stefanova, A. Hikov, I. Peytcheva, V. Sachanski, Milen Stavrev
Two diorite to monzodiorite sills are recently found among the Silurian sedimentary succession near to Asaritsa peak, West Stara Planina Mountain. Several levels with diagenetic metalliferous nodules occur within shale interval in the sediments. The magmatic rocks are affected by strong propylitic to sericitic alteration (chlorite, sericite, albite and quartz) and only relicts of the rock-forming minerals (feldspar, biotite and clinopyroxene) are observed. The bodies are crosscut by thin quartz veins and disseminated pyrite is observed. The chondrite normalized spidergrams show patterns similar to orogenic rocks, with very high peaks of Th and U and depletion in Sr and Ti. The zircon U-Pb geochronology reveals that the magmatic crystallization is during the Carboniferous period – 326.4±3.2 Ма, with low content of xenocryst most probably from the sedimentary basement. The magmatic activity coincides with the Variscan orogeny formed during the late Paleozoic and most probabaly is related to the evolution of the alkaline Buhovo-Seslavtsi Pluton which is situated just to the south, at a direct proximity. The different composition of the pyrite from the sills and the diagenetic nodules from the sediments is most probably due to their different genesis. While the alterations of the nodules can be attributed to metasomatic processes related to the magmatic activity.
{"title":"Carboniferous sills and related metasomatic activity in the area of Asaritsa Peak, West Stara Planina Mountain","authors":"Stoyan Georgiev, Elitsa Stefanova, A. Hikov, I. Peytcheva, V. Sachanski, Milen Stavrev","doi":"10.52215/rev.bgs.2023.84.3.85","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.85","url":null,"abstract":"Two diorite to monzodiorite sills are recently found among the Silurian sedimentary succession near to Asaritsa peak, West Stara Planina Mountain. Several levels with diagenetic metalliferous nodules occur within shale interval in the sediments. The magmatic rocks are affected by strong propylitic to sericitic alteration (chlorite, sericite, albite and quartz) and only relicts of the rock-forming minerals (feldspar, biotite and clinopyroxene) are observed. The bodies are crosscut by thin quartz veins and disseminated pyrite is observed. The chondrite normalized spidergrams show patterns similar to orogenic rocks, with very high peaks of Th and U and depletion in Sr and Ti. The zircon U-Pb geochronology reveals that the magmatic crystallization is during the Carboniferous period – 326.4±3.2 Ма, with low content of xenocryst most probably from the sedimentary basement. The magmatic activity coincides with the Variscan orogeny formed during the late Paleozoic and most probabaly is related to the evolution of the alkaline Buhovo-Seslavtsi Pluton which is situated just to the south, at a direct proximity. The different composition of the pyrite from the sills and the diagenetic nodules from the sediments is most probably due to their different genesis. While the alterations of the nodules can be attributed to metasomatic processes related to the magmatic activity.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139191193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-01DOI: 10.52215//rev.bgs.2023.84.3.315
Aleksandar Tanasković, Vesna Ristić Vakanjac, D. Polomcic, Jelena M. Močević
A sufficiently long time-series of daily discharges is needed to assess the discharge dynamics and calculate the water balance equation parameters of a spring (river source). The paper assumes that a catchment is gauged if a time-series of observations of at least 30 years is available, which is a rare case in Serbia. One-year monitoring is often set up to verify the reserves of a water source or spring intended for capture. Monitoring ceases after the final report is produced. The paper aims to show potential problems if there are no sufficiently long time-series and if no detailed hydrogeological investigations have been undertaken. The Gornji Dušnik Spring is used as an example. That spring drains the western parts of Suva Planina Mountain. It was captured many years ago to provide public water supply to the town of Gadžin Han and the nearby villages of Donji Dušnik and Gornji Dušnik.
要评估泉水（河流源头）的排水动态并计算其水平衡方程参数，需要足够长的日排水时间序列。本文假定，如果有至少 30 年的观测时间序列，就可以对集水区进行测量，但在塞尔维亚这种情况很少见。通常会进行为期一年的监测，以核实水源或泉水的储备情况。监测工作在最终报告编制完成后停止。本文旨在说明，如果没有足够长的时间序列，如果没有进行详细的水文地质调查，可能会出现的问题。本文以 Gornji Dušnik 泉水为例。该泉水流经苏瓦普兰纳山西部。多年前取水是为了向 Gadžin Han 镇及附近的 Donji Dušnik 和 Gornji Dušnik 村提供公共供水。
{"title":"A contribution to the understanding of the discharge dynamics and water balance of the karst spring Gornji Dušnik (Suva Planina)","authors":"Aleksandar Tanasković, Vesna Ristić Vakanjac, D. Polomcic, Jelena M. Močević","doi":"10.52215//rev.bgs.2023.84.3.315","DOIUrl":"https://doi.org/10.52215//rev.bgs.2023.84.3.315","url":null,"abstract":"A sufficiently long time-series of daily discharges is needed to assess the discharge dynamics and calculate the water balance equation parameters of a spring (river source). The paper assumes that a catchment is gauged if a time-series of observations of at least 30 years is available, which is a rare case in Serbia. One-year monitoring is often set up to verify the reserves of a water source or spring intended for capture. Monitoring ceases after the final report is produced. The paper aims to show potential problems if there are no sufficiently long time-series and if no detailed hydrogeological investigations have been undertaken. The Gornji Dušnik Spring is used as an example. That spring drains the western parts of Suva Planina Mountain. It was captured many years ago to provide public water supply to the town of Gadžin Han and the nearby villages of Donji Dušnik and Gornji Dušnik.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139192275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.77
Šime Bilić, I. Peytcheva, Stoyan Georgiev, A. Hikov, Ivica Pavičić, Gordana Deljak, F. Šumanovac, Marko Holma
The study presents petrographic and compositional data of Late Cretaceous bauxite deposits in the area of Jajce, Bosnia and Herzegovina. Results indicate that bauxites exhibit ooidic to pisodic textures enclosed within a pelitomorfic matrix. Most of the deposits are boehmitic but in some localities, a considerable quantity of diaspore is identified. Hematite is the dominant Fe-mineral, while kaolinite, goethite and calcite are minor. The accessory minerals are represented by anatase, rutile and zircon. Al2O3 content ranges between 54.32–61.05 wt % and is negatively correlated to Fe2O3. Rare earth elements (REE) show variable concentrations, reaching up to 1353 ppm. The chondrite normalized patterns reveal negative Eu anomaly in all and positive Ce anomaly in almost all samples. Ce anomaly shows negative correlation with REE. Bauxites from the Jajce area represent valuable mineral resource with potentially valuable quantities of REE and Sc. Mineralogy and geochemical signature indicate a complex petrogenetic history.
本研究介绍了波斯尼亚和黑塞哥维那亚伊采地区晚白垩世铝土矿床的岩石学和成分数据。研究结果表明，铝土矿呈现出鲕状至雉状纹理，并被包裹在鲕状基质中。大部分矿床为铁铝土矿，但在一些地方也发现了相当数量的透辉石。铁矿石是主要的铁矿物，而高岭石、鹅卵石和方解石则是次要矿物。附属矿物有锐钛矿、金红石和锆石。Al2O3 含量介于 54.32-61.05 wt % 之间，与 Fe2O3 呈负相关。稀土元素（REE）含量不一，最高可达 1353 ppm。软玉归一化模式显示，所有样本的 Eu 异常均为负值，几乎所有样本的 Ce 异常均为正值。铈异常与 REE 呈负相关。Jajce 地区的铝土矿是宝贵的矿产资源，可能含有大量有价值的 REE 和 Sc。矿物学和地球化学特征显示了复杂的成岩历史。
{"title":"Petrography and geochemistry of Cretaceous bauxites from Jajce, Bosnia and Herzegovina","authors":"Šime Bilić, I. Peytcheva, Stoyan Georgiev, A. Hikov, Ivica Pavičić, Gordana Deljak, F. Šumanovac, Marko Holma","doi":"10.52215/rev.bgs.2023.84.3.77","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.77","url":null,"abstract":"The study presents petrographic and compositional data of Late Cretaceous bauxite deposits in the area of Jajce, Bosnia and Herzegovina. Results indicate that bauxites exhibit ooidic to pisodic textures enclosed within a pelitomorfic matrix. Most of the deposits are boehmitic but in some localities, a considerable quantity of diaspore is identified. Hematite is the dominant Fe-mineral, while kaolinite, goethite and calcite are minor. The accessory minerals are represented by anatase, rutile and zircon. Al2O3 content ranges between 54.32–61.05 wt % and is negatively correlated to Fe2O3. Rare earth elements (REE) show variable concentrations, reaching up to 1353 ppm. The chondrite normalized patterns reveal negative Eu anomaly in all and positive Ce anomaly in almost all samples. Ce anomaly shows negative correlation with REE. Bauxites from the Jajce area represent valuable mineral resource with potentially valuable quantities of REE and Sc. Mineralogy and geochemical signature indicate a complex petrogenetic history.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139193344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-01DOI: 10.52215/rev.bgs.2023.84.3.73
Lora Bidzhova, Emiliya D. Raeva, Gatien L. F. Morin, Svetoslav V. Georgiev
Trace element abundances in organic-rich sediments are widely used in various fields of the geosciences, yet few contributions discuss the effectiveness of low-cost benchtop acid digestion techniques for such samples. Here, we tested three different sample preparation methods (acid digestion in closed and open vessels, and fusion) on twelve powder aliquots of organic-rich sediment, standard reference material NIST 2702. Comparison of newly obtained ICP-MS and LA-ICP-MS results with their respective certificate values, facilitates the assessment of digestion efficiency and the effects of vessel size, acid mixture, and other parameters on the recoveries of 29 trace elements. Our results show that benchtop digestion of organic-rich sediment in closed 7 mL PFA vessels using HF+HNO3+HClO4 mixture is more efficient compared with open vessel digestion treated with the same acid mixture (± HCl), with closed or open vessel digestions without HClO4, and with LA-ICP-MS measurements on fused glass discs.
{"title":"Efficient benchtop acid digestion of organic-rich sediments for ICP-MS analyses: testing analytical procedures on NIST 2702 standard reference material","authors":"Lora Bidzhova, Emiliya D. Raeva, Gatien L. F. Morin, Svetoslav V. Georgiev","doi":"10.52215/rev.bgs.2023.84.3.73","DOIUrl":"https://doi.org/10.52215/rev.bgs.2023.84.3.73","url":null,"abstract":"Trace element abundances in organic-rich sediments are widely used in various fields of the geosciences, yet few contributions discuss the effectiveness of low-cost benchtop acid digestion techniques for such samples. Here, we tested three different sample preparation methods (acid digestion in closed and open vessels, and fusion) on twelve powder aliquots of organic-rich sediment, standard reference material NIST 2702. Comparison of newly obtained ICP-MS and LA-ICP-MS results with their respective certificate values, facilitates the assessment of digestion efficiency and the effects of vessel size, acid mixture, and other parameters on the recoveries of 29 trace elements. Our results show that benchtop digestion of organic-rich sediment in closed 7 mL PFA vessels using HF+HNO3+HClO4 mixture is more efficient compared with open vessel digestion treated with the same acid mixture (± HCl), with closed or open vessel digestions without HClO4, and with LA-ICP-MS measurements on fused glass discs.","PeriodicalId":509487,"journal":{"name":"Review of the Bulgarian Geological Society","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139194393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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